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How to
Distributive Property
How to
Exponents
How to
Inequalities
How to
Ratios
How to
Trigonometric Identities
How to
Trigonometry
How to
Synthetic Division
How to
Fractions
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Polynomials
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Quadratic Formula
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5:20
Khan Academy
Sal Khan
Intro to the imaginary numbers
Learn about the imaginary unit, "i", a unique number defined as the square root of -1. It's a key part of complex numbers, which are in the form a + bi. The powers of "i" cycle through a set of values.
Jul 11, 2011
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